RoBi3.0 said:
Ledan said:
RoBi3.0 said:
Animal populations are artificially enlarged right now because humans are raising them for food. Animal populations natural regulate themselves and typically grow no bigger then the area they live can support. There are some exception such as an animal being introduce to an area for another part of the world and therefore having no natural predator to control the population, but that only ever occurs because of human involvement.
There have been cases where animals are introduced to new regions without human involvment. Cant remember exactly which places or animals.... except for when humans first came to Australia and devoured the largest mammals there..... but i know there are other cases!
I hope you realize that there is a difference between animal migration and Instances like the Snakehead fish that now Infests a large part of the north east united states. With natural migrations predators follow the pray thus populations remain in check. In the case of the snakehead fish Asian imager ant imported the speices into the U.S. as food. Then for whatever reason they were let lose into the enviroment. Since they were moved to an area in a relatively short time their natural predators did not follow and now they wreak havoc where ever they go. Most annoying thing about this particular fish is once it destroy whatever pond or land locked ecosystem it happens to be living in it just struts out of the pond and WALKS of to find another body of water to fuck up, making it really hard to deal with.
That is what is was referring to, since I am not a zoologist I suppose sometime in earths long history a speices could have migrated to an area and not have been followed by its predator therefor wreaking similar havoc, but that would be very rare. So grats on finding the two words in my post that may not be completely accurate.
In the interest of expanding my own knowledge some links to the cases you mentioned or more info so I could look it up myself would be welcomed.
I wasn't thinking of natural migration, but of instances when animals have by chance come to a new envrionment. I would do some research and provide some links for you, but it already the middle of then night here.... I'm pretty sure I came by this information while studying biology.
Some animals (think it was a snake) have been carried to isolated areas by tides and driftwood. I think the specific example was snakes coming to an island.
Another point about your original post, though you probably know this already and im just being picky, animal populations are in a constant state of flux. Often this population is larger than what the environment can support, so the animals best adapted to the environment survive. The supportive cappacity of animals environments are also in a constant state of flux, but usually always right themselves. A limited example:
A natural drought will cause there to be less grass, supporting less rabbits, supporting less foxes. Next cycle there will be more grass, but also more rabbits since there are less foxes, so more foxes will breed, causing there to be less rabbits.... yadiyadi until the system rights itself before another sudden change or gradual change.
